Pv Inverter Testing For Momentary Cessation And Rate Of Change Of Frequency Events Preprint
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Pv Inverter Testing For Momentary Cessation And Rate Of Change Of Frequency Events Preprint
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Author :
language : en
Publisher:
Release Date : 2023
Pv Inverter Testing For Momentary Cessation And Rate Of Change Of Frequency Events Preprint written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.
To understand the power system stability and develop better electromagnetic transient (EMT) models of field deployed photovoltaic (PV) inverters, it is important to characterize inverters' response to abnormal voltage and frequency scenarios. Because EMT models are not typically available for small distribution-connected PV inverters, and because inerterconnection standards historically did not specify desired ride-through behaviors, we tested two such inverters in the lab to characterize their responses to severe undervoltage events and high rate-of-change-of-frequency (ROCOF) conditions. The inverters tested were pre-IEEE 1547-2018 residential PV inverters widely used in the Hawaiian Electric territory and many other areas. The testing results for undervoltage scenarios showed that the inverter from one vendor exhibited momentary cessation while the inverter from the other vendor did not exhibit momentary cessation behavior or tripping for most of the events below the 120 ms undervoltage trip threshold duration set by IEEE 1547-2003. The testing results for ROCOF scenarios showed that the inverter from one vendor temporarily lost synchronization during ROCOF conditions while the inverter from the other vendor did not lose synchronization or cease generation for any ROCOF conditions. Both the inverters were also tested for EMT-simulated grid events with severe changes in frequency and voltage. The observed responses of the inverters were different from the simulated response of PV inverters represented the best available assumptions from pre-existing information. The results from these experiments can be used to update the inverter models used in bulk power system studies.
Characterization Of Der Momentary Cessation And Rate Of Change Of Frequency Response
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Author :
language : en
Publisher:
Release Date : 2022
Characterization Of Der Momentary Cessation And Rate Of Change Of Frequency Response written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Momentary cessation (MC) and response to rate-of-change-of-frequency (ROCOF) are inverter responses that can have a serious impact on the stability of the grid during abnormal conditions. Though IEEE Std 1547-2018 provides fairly well defined expected responses from inverter-based DERs during abnormal grid conditions, a significant portion of currently installed DERs in the distribution network do not have a well defined response to abnormal grid conditions. Any analysis of the grid involving inverter MC and ROCOF response must consider the specific characteristics of these responses for the installed DERs to have better confidence in the analysis results, especially for grids with high levels of DERs. However, there is lack of information on MC and ROCOF response for the inverters already installed in the field. In this paper, we examine a large data set of installed inverters to map the dominant population of installed inverters. This information is then used to characterize the most dominant MC and ROCOF responses of installed inverters using experimental data.
Experimental Determination Of Pv Inverter Response To Grid Phase Shift Events Preprint
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Author :
language : en
Publisher:
Release Date : 2019
Experimental Determination Of Pv Inverter Response To Grid Phase Shift Events Preprint written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
With the continued growth of renewable energy resources which interface to the electric grid via inverters, the understanding of such devices becomes ever more important to the safe and reliable operation of the bulk power system. This work investigates the specific response of a utility-scale PV inverter to grid voltage phase shift-type disturbances which sometimes occur during grid fault events. The role of the PV inverter's phase-locked-loop (PLL) is identified as important to modeling the response. Switching-level simulations of a utility-scale PV inverter with a modeled PLL show a characteristic response when phase shift disturbances require the PLL to track what appear as fast frequency changes. Additionally, in this work a full-scale laboratory testing was carried out using the Opal real time (RT) OP5142 real time simulator and a large grid simulator to create phase shift disturbances with a high degree of repeatability. A photovoltaic (PV) inverter was connected to a grid simulator, and phase shifts were instantaneously implemented on the simulated grid, the results of the currents were then obtained. The experimental results obtained were validated with simulation results obtained from MATLAB/Simulink.